Mouth guard



FIG. 1 is a top perspective view of a mouth guard showing my new design;

FIG. 2 is an enlarged portion view labeled FIG. 2 in FIG. 1;

FIG. 3 is a bottom perspective view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a front elevational view thereof;

FIG. 7 is a right side elevational view thereof, the left side elevational view being a mirror image; and,

FIG. 8 is a bottom plan view thereof.

The long-dash-dot lines in FIGS. 1 and 2 indicate the boundary of the enlarged portion view of FIG. 2 and form no part of the claimed design. 

CLAIM The ornamental design for a mouth guard, as shown and described. 